Automatic needle stop for bristling machine



April 7, 1942 w. P-G. HALL 2,279,055 l AUTOMATlC NEEDLE STOP FQR BRSTLING MACHINE l Filed YJune 27, 1940 u EEEE dr r Patented Apr. 7, 1942 AUTOIWATIC NEEDLE STQB FORBRISTLING Williem'Peon-Goskill HalllerWvmPae assigner 't Adu Pont de Nemours &C'o mpany, W11- nn'gton'D'el., a corporation offDelayvare invention relates in general to brietline. mao-tunesie the brush mals-ine artt. and more parto automatic stop mechanism for a fteettine mechanism.

'L @die s; of the. invention includeY the; provision ta new and improved brush toit-setting needle meohenism haring automatic; means, 'for the immediate-,stopping 'of the power therefor upon the engagement of the needle. with any obstruction Q1 ,l Qblet wliliCh it is not intendedthat the needle shall-penetrate; the provision of an automatio needle stop mechanism in which the needlev oriventhrough the medium of resilient means ofsuohg-tension .that therneedlewill be rigidly driven-into the holes. into. which Ythe tuft of bristles, is'to be inserted, but which will yie1d upon the engagement of the needle with any defectgive. brush blank which has been improperly drilled or which lacks any of therequisite holes, to; operate: a switch to shut off the power; the provision ofr an automatic needle stop mechanism in' which the needle is driven thru a compressed spring which will yield to allow the needle to retreat to operate a `switch and shut off the power when the needle encounters an obstruction', and inwhioh the spring tension may beadjusted; and thefprdvisionof an automatic need-lefstop for brush tuft-setting machines, in which a Inicror-.swtchis used as the power interrupter;A yand which yis provided with adevice for the adjustmentof ther point of operaltionof the same.

' @they ob'ject'sand advantages of the invention will appear hereinafter.`

Reference is to be had drawing, 'in-which K Fig. `1 is a sectional View thru the entire needle mechanism' forming the'present inventionand showing the parts in operative position; Y

to the accompanying Fig. z is e sectional view ofl the teppeijt ofthe mechanism showing the p arts in power stopping positiong" Fig. Bris a view in elevation of the switch supporting bracket; 1

` FigflisV a' plan view of Fig. 3, looking in the direction of the arrow 4; A'

Fig-` 5'is a' view in elevation of a nut for the spring adjustment; 'y `f A y 'y 'Eig 6 is an elevation of thev top part Aof the needle tube or cylinder; v

Fig. 7, is an elevation of the W1 end 'of the` needle ebook.: and

Fieis en enlarged section on line 8,-8 of Shown il? .Fie l, a brush 10 is to have its' ien. June 2,7, 1949., Seriell No. 342,1@

1d Claims.

bristle tufts l2 inserted by, means of a. needle I4, which is vertically reciprocated by means of tube or cylnider- 11,6 in guide IB. The tube I6'is reciprocated by a convenient crank or lever pivotally attached thereto, not here shown but'which may e' be similar to levers |82 or -21-33 in PatentNo.

1,8%)63141--to Person. It is to be understood that. a tuft ofbristles is fed to the needle as by a bristle picker', and the needle I4 descends, engages the: center of the tuft,- doubles the same in a convenient die, and Acontinuing to descend,

insertsftheu doubled tuf-t in the 'brush Il]v in conejunctionvr with ananchor, asin the above mene tioned patent. AsA the needle ascen'ds, a further tuft is brought -into place, and the operation is repeated.-v lt sometimes happensthat the brush is improperly placed or drilled; or is not provided` with `the requisite holes, or anobstruction gets in th-e'way of the 'needle, and the needle then breaks unless the power toj th'evdevice can be "simultaneouslyfshut off. 'To'thisend the present in,-

vention' iso-directed, and it providesmeans'toshut off the-'power immediately upon the engagement of the' needle with Van undesired obstacle or ob-l of asernifcircular'backing' up'element 24 andset screws 26.- The upper end of the chuck has a' tappedY hole 28 for the threaded'recepti'on of a long needlerod `3l] having a'lock nut 32 for 'the accurate-positioning of the rod in the chuck; Towards the upper end oftherod, it is'enlarged indameter and threaded as at 34 for a purpose to' be explained, and 'the rod will be'seen to'ex`- tend vthru the thereof.l l

A` ferrule 36 having a relatively long hollow screwl threaded portion 38 is adapted to be slid into"l the needle tube ll6', but' is not threaded therewith.' Instead, an venlart'red threaded head '4d isv provided atthe top ofthe tube, and a screw cap 42 threaded on the ferrule engages with this heeel-` A lookout 4,4 holds the. een 'ir1`plooe-- It will befseen that needle rod 30 extends all the way thru this ferrule and projects outwardly from the top/thereof, and that the ferrule; enditejat the washer 45, provides a rigid abutment fplf a COInDIession spring 48 at one end thereof, the lock nut 33 vforming the other abutment, letter-.beine adiusteme' to very the tension of sorned. 1"

tube yI6 and on out thru the top head 40, screw cap 42, ferrule 36, and spring 48, to the chuck 20, so that needle I4 is reciprocated to set the bristle tufts without any normal re-` silient action.- However, spring 48 is heavy enough so that it need not be fully compressed to obtain the above stated action and is therefore yieldable even under these circumstances, when the needle strikes a hard object, i. e., the

undrilled or imperfect brush blank or other ob-A close the coils of the spring-in order to-make the,N

needle enter the brush blank holes to set the tufts on the down stroke of tube I6. The com'- pression of spring 48 may beyaried by turning nut 50 on the screw 34, or by adjusting lock nut 32 and then backing it by turning upon 'the chuck 20. The upper end of the `ferrule is enlarged as shown and is provided with` a hollow chamber for the reception of a cylindrical nut 5D which is threaded ,onto 4the enlarged end 34 of the needle rod. 5A pair of diametrically opposed arms 52 rise Vfrom `the enlarged end of the ferrule'and supportan end ring or closedtrack 54 Vwhile'allowing convenient access to nut 50. The upper end of needle rod`30 projects thru the nut 50, and ls adapted to support a miroswitch 56 by means ofa yoke 58 having a head 60 which is's'crewv threaded to receive the endof the needle rod, and to form a locknut for the elementv 50. The nut 50 holds the head 6U and switch in desired position.

"Aplun'ger 62 is mounted to slidein a 'tube 64 on the switch, and this plunger is spring` pressed outwardly. 'I'he plunger controls the switch and is 'so arranged that when extended by its spring, the switch is open, and when pressed 'slightly into its tube; the switch is closed. i This type of switch is well known and it is not thought necessary to disclose it in detail. point of operation of the switch 56 may be accomplished by adjusting the switch relative to its yoke 58 by rmeans of slots59'in the yoke, through which s'crews 59' extend to' connect the switch to 'the'yokef Adjustment of thev thus faster and more economical operation of the machine results, due to the provision of the present novel construction.

Having thus described my inventionand the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is:

,1. In a bristling machine, a support adapted to be reciprocated, a needle rod slidably mounted with relation to said support and mounting a.

' needle at one end and a switch at the other end, n e 4rrieans.'nor'mally retaining said support and said struction; thus it is not vnecessary to completely -IOd in Xed TelatOn, and means 01'1 the Support 4-eifective toy operate said switch upon relative movement of said rod and said support.

Y 2. *In a bristling machine, a reciprocable support, a needle rod slidably mounted with relation to said support,a switch mounted on said rod and havinganY operating means associated with said support, whereby relative movement of said `rod vand support will operate said switch, and means normallypreventing such relative movement. 4

3. In' 1a bristling machine, aneedlechuck, a, ferrule spaced therefrom, aresilient member at least partiallyl compressed between said chuck and said ferrule, a switch, means rigidly connecting'said switch and''said chuck, and switch op erating means on vsaid ferrule,` the latter and vsaid The entire mechanism shown in Fig. 1 normal-4 ly `reciprocates vertically when the needle tube I 6 is reciprocated, since although the needle rod is not directly connected to the lferrule, still the tube` moves" the spring 43 as though it were a rigid, link, thru the intermediary of ythe'ferrule, and this inv turn moves chuck .20 and needle rod 30. "Therefore, the parts of the mechanism'will always be in the'relation shown in Fig. 1, even though the needle tube is operating, until the needle strikes a hard object or a defectiveblank. Wh'en vthis happens, the spring 48 ,yields slightly under pressure of the needle','and 'the latter thus y raises the needle rodrelative to the `needle tube and ferrule. lHeadll is thereby moved slightly upwardsthus allowing plunger 62 to extend and This move 01T ring 54, shutting oil' y the power. disposition is illustrated in Fig. 2, wherein the plunger is shown free of the ferrule ring, and the rod` 30 is in `its raised position relative tothe ferrule, Upon removal of the obstruction or defective blank, the spring 48 returns theneedle to'operating condition andthe switch to closed condition, `so that the .bristling' machine may again' be operated with little loss of time. Also, the needle isnot in danger of being broken due to repeated engagement with the obstruction, and

chuck `being capable'of relative movement.

4. In `av bristling machine, a needle tube, a needlefchuck located in said tube, a ferrule in said tube, a spring in said tube compres'sed'.be'y tween said'V needle chuck and said ferrule,said ferrule and chuck being capable of relative move-` ment; means extending from said chuck V and mounting a switch, and a switch actuating 'mem-L ber on said ferrule.

5. In a bristling machine, amovable needle tube, a needle chuck in said tube, a ferrule' con'` nected to said tube and spaced from said chuck, a spring partially compressed -between said chuck and ferrule whereby chuck and ferrule normally move with the tube, a switch, means mounted on said chuck andsupporting said switch, and means on said ferrule t0 operate said switch 4.upon further compression of said springand vconsequent movement of. said chuck relative to the ferrule. l

6. In, aqbristling machine, a needle tubepa'.` rod in said tube mounting a needle and a switch; means -associated with said `tube to operate said switch upon relative movement of said; rod and said tube, means normally preventing such ,movei ment and thereby acting as a rod'driving link,

` said last mentioned means being constructed dle, tube, a needle rod normally movable Vwith .said tube, a switch connected with saidneedle rod, means associated with said tube` for `operation of said switchyupon relative movement o1' said rod and tube, means mounting said rod and said tube for relative movement comprising a relatively stiff spring member constructed andY arranged to be non-yieldable under normal conditions ofoperation so as to act as avrod driving 8. In a bristling machine, a

mounting" a needle at one end and a switch .at

the vother end-means, associated with said' tube adjacent the 'switch to operate the latter upon y e `needle tube, a. needle-rod slidably mounted in said tube and ferrule,'a spring in said tube and bearing against said ferrule at one end and said chuck at the other end, said rod mounting a switch at its extending end, and means on said ferrule adapted to engage a switch actuator on said switch, said spring being adapted to drive said rod.

10. In a bristling machine, a needle, a needle supporting member, and a longitudinally spaced ferrule member, a spring between said members, said spring being compressed to such a degree that it acts as a rigid element when said ferrule member is reciprocated to set bristles in prepared holes in a brush blank, said Spring being set to be yieldable upon the engagement of said needle with an obstruction so that said needle and its supporting member may retreat relative to said ferrule member, a power interruptor on one of said members, and means mounted on the other member and constructed and arranged to operate said interrupter upon the retreat of said needle.

11. In a bristling machine, a needle tube, a needle in said tube, a ferrule adjustably mounted on said tube and having an extension therewithin, a spring compressed between said needle and ferrule extension, a rod connected with said needle, a switch on said rod, vand means on said ferrule to operate said switch upon further compression of said spring.

12. In a bristling machine, a needle for setting tufts of bristles, a rod connected ywith said needle, a switch mounted adjacent an end of said rod and adjustable with respect thereto, a ferrule thru which said rod extends, means on said ferrule to operate said switch upon relative movement of said rod and ferrule, and compression spring means normally preventing such movement. v

13. In a stop motion for a bristling machine or the like, a supporting member, a needle holding member associated with said suppOrting member, a needle adapted to be secured to said needle holding member, means to reciprocate said members together, said means including a resilient element located between said members and under sufficient tension to drive said needle into the holes of a blank to be bristled, said resilient element being yieldable to allow said needle member to retreat relative to said supporting member upon engagement of said needle with an obstruction, a power interrupter for said reciprocating means, said interrupter being mounted on one of said members, and means mounted on the other of said members for operating said interruptor upon such retreat.

14. In a stop motion for a bristling machine or the like, the combination of a movable supporting member, means to move said member, a needle, a needle holding member connected to said supporting member, and a resilient element located between said members and effective to normally rigidly secure the same, said element being yieldable to permit relative movement of said members upon engagement of said needle with an obstruction; with a power interrupting device mounted on one of said members, and means associated with the other member to operate said device upon said relative movement, said device being located in the path of movement of said last named means relative to said one member.

WILLIAM PlimN-GASKILL HALL. 

